Control apparatus and system



Sept. 9, 1924. 1,508,237 H. D. MURDOCK CONTROL APPARATUS AND SYSTEMFiled Oct. '7. 1921 WITNESSES: INVENTOR Q?- gjmm flew/3g Murdock vATTORNEY Patented Sept. 9, 1924-.

UNITED STATES PATENT OFFICE.

HENRY D. llIURDOCK, O13 VJILKINSBURG, PENNSYLVANIA, ASSIG-NOR TOWESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORIORATIUN' OFPENNSYL- VANIA;

CONTROL APPARATUS AND SYSTEM.

Application filed October 7, 1921.

To all whom it may concern:

Be it known that I, HENRY D. Munnoon, a citizen of the United States,and a resident of \Villrinsburgin the county of Allegheny and the Stateof Pennsylvania, have in vented a new and useful Improvement in ControlApparatus and Systems, of which the following is a specification.

My invention relates to control systems and it has particular relationto control systems embodying a line switch that is governed by acontroller.

One object of my invention is to provide an improved method for socontrolling a line switch that it shall be closed upon the controllerbein actuated in one direction and opened upon the controller beingactuated in another direction.

Another object of my invention is to provide a control system for sogoverning a line switch that it may be closed only upon the controllerbeing actuated in a forward direction to its first operative position.

Another object of my invention is to pro vide means for governing a lineswitch that shall be simple and economical in construction and positiveand reliable in operation.

Briefly speaking, my invention consists in employing a relay having aplurality of op positely wound coils to govern the closure of a lineswitch, the energization of the coils of the relay device beingselectively governed by means of a switching device that is associatedwith a master controller.

For a better understanding of my invention,'reference may be made to theaccompanying drawing,

Figure 1 of which is diagrammatic view of a motor-control systemembodying my invention v and Fig. 2 is a view, in side elevation, ot'aportion ofa controller that is illustrated in Fig. 1 of the drawing.

Referring to Figs. land 2 of the drawing, a motor 1, having an armature2 and a series field-magnet winding 3, is energized, upon the closure ofa line switch 6, from a source of electrical energy, such, for example,as a trolley-wire 4:, through a trolley-pole 5, the line switch orcircuit-breaker 6, actuating coil of an overload trip 1%, series feldinagnet winding 3 and armature 2 of the motor 1 and starting resistor7 to urlOdIlCl.

The line switch 6 is provided with an actuating coil 8, the energizationof which is Serial No. 505,995.

governed by a relay device 9 having a plurality of oppositely-woundactuating coils 11 and 12, and a controller 13. The overload trip 1% isprovided for opening the line switch 6 upon the occurrence of excessivecurrent conditions. The relay device 9 is provided with a core member 15and a pivotally mounted armature member 16 which is biased to its openposition by means of a resilient member or spring 17.

A stationary control linger 18 is adapted to be engaged by a contactmember 19 that is securely mounted upon the armature member 16. Theenergization of the coils 11 and 12 of the relay device 9 is governed bythe controller 13, which may comprise a rotatably mounted shaft 21 uponwhich is secured a non-conducting drum member 22 having an Oil positionand a plurality of operating positions.

A contact segment 23, which is securely mounted upon the drum 22, iselectrically connected to Ground by means of a circuit comprising aconductor 2%, shaft 21 and conductor 25 in accordance with a familiarpractice. An arm 26, which is resiliently mounted upon a block 2?constituting part. of the controller 13, is provided with a pivotallymounted member 28. The member 28, which may be actuated by frictionalengagement with drum 22, engages the contact segment when the controller13 occupies its first position, which is the position illustrated inFig. 1 of the drawing.

The pivotally mounted contact member 28 is permanently connected to theactuating coil 11 of the relay device 9. lVhen the pivotally mountedinemb 28 is actuated in a clockwise direction by the drum member 22 ofthe controller 13, the member 28 engages a stationary contact member 29which is permanently electrically connected to the actuating coil 12.

A pivotally mounted member 31, which is adapted to move between aplurality of stops 32 and 33, prevents the pivotally mounted contactmember 28 from engaging the contact segment 23 when the drum 22 isactuated in a counter-clockwise direction toward its Oil position.

The closure of the line switch 6 is efiected by actuating the controller13 from its Oil position to its first position, wherein the contactsegment 23 engages the pivotally mounted contact member 28, therebyestablishing a circuit from the trolley-wire t through contact membersof the overloadtrip 14, auxiliary resistor 84, actuating coil 8 of theline switch 6, actuating coil 11 of the relay device 9, pivotallymounted member 28, contact segment 23, conductor 2%, controller shaft 21and conductor to Ground.

When the coil 11 of the relay 9 is energized, the armature member 18thereof assumes its closed position, thereby establishing a holdingcircuit from the trolley-wire a through the contact members of the relaydevice 14:, auxiliary control resistor 84, actuating coil 8 of the lineswitch 6, actuating coil 11 of the relay device 9, control lingers 18and 19 of the relay device 9 and auxiliary control resistor to Ground.

lVhen the'controller 13 is actuated beyond the first position, thecontact segment 28 is no longer engaged by the control linger However,the coils 8 and .11 or the line switch 6 and relay 9, respectively, areonergized by the holding circuit througlithe control fingers 18 and 19,which has just been described.

hen the controller 13 is actuated in counter-clockwise direction, thepivotally mounted contact member 28 is actuated in a clockwise directionby its frictional engagement with the drum 22, thereby causing thecontact member 28 to engage the statYonary contact member 29. I

Under these conditions, a circuit is established from the trolley-wire4; through contact members of the overload relay 1 1, an iliary controlresistor Shactuating coil 8 of the line switch 6, actuating coil 12 ofthe relay 9, stationary contact member 29, pivotally 'mounted contactmember 28, control fingers 18 and 19 of the relay device 9 and auXliarycontrol resistor 35 to Ground.

When both coils 11 and 12 of the relay device 9 are energized, the relaydevice will be quickly opened by the armature member 18 being actuatedin a counter-clockwise direction by the spring 17, as the coils 11 and12 are oppositely wound, thereby establishing opposing magnetic fields.

When the armature member 6 of the relay device 9 assumes its openposition, coil 8 of the line switch 6 andcoils 11 and 12 of the relaydevice '9 are tie-energized, as the movable control finger 19 no longerengages the stationary control finger 18. The line switch 6 will not beclosed, when the controller 13 is returned to its first position, as thepivotally mounted member 31 forces the contact member 28 outwardly toprevent it from engaging the contact segment 23.

From the above description, it is apparent hat, by means of a simplerelay device and a switching device, which may be mounted on practicallyany controller, it is possible to secure efiective and positiveoperation of a line switch, the relay device being so desgned as toinsure very rapid opening of the switch, when the controller is actuatedin a reverse direction.

If it is considered preferable to dispense with the relay 9,substantially the same arrangementot' circuits may be obtained byproviding the line switch 6 with two opposite'ly wound coils and anauxiliary contact member for establishing a holding circuit.

lVhile I have shown my invention in a preferred form, it is apparentthat other modifications may be made in the arrangement of the circuitsand in the apparatus employed without departing from the spirit of myinvention. I desire, therefore, to be limited only by the scope of theappended claims.

claim as my invention:

1. In a control system, the combination with a translating device, of aswitch for energizing said device, a controller having a plurality ofoperative positions, and means comprising plurality of coils governed bysaid controller for closing said switch only upon said controller beingactuated to its first operative position and for opening said switchupon said controller being actuated in a reverse direction.

2.111 a control system, the combination with a translating device, or a.switch for energizing said device, a relay device for governing saidswitch, a controllerhaving a plurality of operative positions, and meanstroller and means actuated by said controller for selectively energizingsaid coils.

5. In a control system, the combination with a translating device and aswitch having an actuating coil for governing the energization of saiddevice, of a relay device having a plurality of actuating coils forgoverning the energization of the coil of said switch, and meanscomprising a controller for selectively energizing the coils of saidrelay device.

6. In a control system, the combination with a translating device and aswitch having an actuating coil for governing saiddevice, of a relay;device having a plurality of actuating coils ior governing theenergization of the coil of said switch, a controller having a pluralityof positions, and means associated with said controller for governingthe energization of the coils of said relay device, one of said coilsbeing energized by said means when said controller is actuated in onedirection, and the other of said coils being energized by said meanswhen said controller is actuated in the reverse direction.

7. In a control system, the combination with a translating device andmeans comprising a switching device for governing the energization ofsaid translating device, said switching device having a plurality ofcoils, of a controller and means actuated by said controller forselectively energizing said coils.

8. In a control system, the combination with a translating device andmeans comprising a switching device for governing the energization ofsaid translating device, said switching device having a plurality ofactuating coils, of a controller and means governed by said controllerfor energizing one of said coils upon said controller being actuated inone direction and for energizing another of said coils upon saidcontroller being actuated in another direction.

9. In a control system, the combination with a translating device andmeans comprising a switching device for governing the energization ofsaid translating device, said device having a plurality of coils, of acontroller having an Oil position and means comprising a movably mountedmember for governing the energization of said coils, one of said coilsbeing energized upon said member being actuated by said control ler to apredetermined position and the other of said coils being energized uponsaid member being actuated by said controller to another position.

10. In a control system, the combination with a translating device andmeans comprising a switching device having a plurality of coils forgoverning the energization of said translating device, of a controllerhaving an Off position and a plurality of operating positions, and meanscomprising a movably mounted member for selectively energizing saidcoils, one of said coils being energized upon said controller beingactuated forwardly to its first operative position and the other of saidcoils being energized upon said controller being actuated toward the Oilposition.

11. In a control system, the combination with a translating device and aline switch having an actuating coil for governing the energization ofsaid device, of a controller having an Oil position and a plurality ofoperative positions, a relay device having a plurality of coils, meansassociated with said controller for energizing one of the coils of saidrelay and the coil of said switch only upon said controller beingactuated to its first operative position, means independent of saidcontroller for maintaining said coils energized, and means comprisingthe other coil of said relay and said first and second means forde-energizing said coils upon said controller being actuated toward itsOil position.

In testimony whereof, I have hereunto subscribed my name this 27th dayof September, 1921.

HENRY D. MURDOGK.

